The Indomitus Crusade books starting with Avenging Son have a lot of the Guilliman grumbling scenes but a lot of it is just fairly generic Space Marine schlock. Watchers of the Throne is about a Custodes and a Sister of Silence in almost a buddy cop kind of match up and the second book delves a lot into the machinations of Imperial politics following Guilliman's return.
The Indomitus Crusade books starting with Avenging Son have a lot of the Guilliman grumbling scenes but a lot of it is just fairly generic Space Marine schlock. Watchers of the Throne is about a Custodes and a Sister of Silence in almost a buddy cop kind of match up and the second book delves a lot into the machinations of Imperial politics following Guilliman's return.